重力驱动系统是非能动系统的主要类型 ,具有安全、经济、可靠性高等多项优点 ,发展潜力很大。本文对非能动系统和重力驱动系统的研究现状进行了综合分析。结合各国重力驱动系统的结构 ,探讨了各国设计研究的特点。介绍了重力注硼系统的结构 ,并与国外设计进行了对比分析 ,指出了重力注硼系统在结构设计上的突出优势及在非能动系统发展过程中的重要地位 Gravity-driven system is the main type of non-active system, with a number of advantages of safety, economy, high reliability, great potential for development. In this paper, a comprehensive analysis of the current research status of passive and gravity-driven systems is carried out. Combined with the structure of gravity-driven systems in various countries, the characteristics of design and study in various countries are discussed. The structure of gravity boron injection system is introduced and compared with foreign design. The prominent advantages of gravity boron injection system in structural design and its importance in the development of passive system are pointed out